Observer2<A, B> class
A widget that listens to two IObservables and rebuilds whenever either one of them emits a new value.
Useful when your UI depends on the combined state of two observables.
Example: Observer2( observable: counter, observable2: isLoggedIn, builder: (context, count, loggedIn) { return Text('$count | Logged in: $loggedIn'); }, );
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- Observer2
Constructors
-
Observer2({Key? key, required IObservable<
A> observable, required IObservable<B> observable2, required Widget builder(BuildContext context, A o, B o2)}) -
Creates an Observer2 widget to observe two observables.
const
Properties
- builder → Widget Function(BuildContext context, A o, B o2)
-
Builder function that uses both observable values to build the widget.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
-
observable
→ IObservable<
A> -
First observable value.
final
-
observable2
→ IObservable<
B> -
Second observable value.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< Observer2< A, B> > -
Creates the mutable state for this widget at a given location in the tree.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children.
inherited
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited